Don't worry, it's usually nothing to worry about.
Our flowers may look a little tired after the long journey they had, and just need a little care and attention upon arrival, especially letterbox flowers.
Pop them into fresh, room temperature water and keep them somewhere bright (away from direct sunshine or too hot places in your house). After 24 hours they should perk up and look like new!
If they don't recover after this period, or in case the flower gift arrived damaged, please contact Customer Support with a photograph of the damage or the condition of the flowers.